<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>不改变display实现水平居中</title>
    <style>
        body {
            text-align: center;
        }
        /* 
        如何让内联元素或内联块元素水平居中
        1.改变元素自身的display属性,使用margin-left,margin-right方案
        2.给它爹设置text-align:center;
         */
    </style>
</head>

<body>
    <div>
        <a href="#">a</a> <br>
        <button>btn</button>
    </div>

</body>

</html>